A. (g ∘ f )(2) = 72
B. (g ∘ f )(2) = 39
C. (g ∘ f )(2) = 99
D. (g ∘ f )(2) = 32
Evaluate the function for the given value of x. f (x) = x^2 + 2x, g(x) = 5x - 1, (g ∘ f )(2) = ?
2016-06-20 6:01 pm
回答 (1)
2016-06-20 6:40 pm
✔ 最佳答案
f(x) = x² + 2xg(x) = 5x - 1
(g∘f)(x)
= g(f(x))
= g(x² + 2x)
= 5(x² + 2x) - 1
= 5x² + 10x - 1
(g∘f)(2)
= 5(2)² + 10(2) - 1
= 39
...... The answer is : B. (g∘f)(2) = 39
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20160620100113AAUrBNW